Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd038dd268d5d545…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 06:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 861bb2c909a5992420640ba72eab0048 SHA-1: 0bc0d6954601807899a16d2f1dd77b37850a6eec SHA-256: cd038dd268d5d545fbd90cae4071756df7856123d4f6e8736827e24334bd52a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the link farm suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g1kjo2odc9t63umq119f8luq9m/59211189577.pdf In PDF document text
    • https://pachetedeturism.ro/images/files/kugozogumovokamepufabo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/76653314813.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/45oq149of9od918qdb64hhh2iv/posogatavireriti.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/74716615235.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c848f386a---1297964135.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/difep.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/69550512444.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/tipukuwizaroxiwis.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/25515373354.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ba506ccd58cb2de95a53e2078a77447d/laxapifotap.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a3a4dd076228c2e57985fa60852f82bb/jizosa.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/vitenumog.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mesugetejigogisam.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/39576404961.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/43349252901.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/55738283969.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118d78340971---21079556571.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/wexisilugokupusunelo.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/58010596810.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c68344d484e---78837954595.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/lajepegawurodoved.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/32589418385.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3606cf4e36a8dd264c65ff87ff229184/mowepegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ord+to+yycPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 18060 bytes
SHA-256: a96db50f2410b1fd5d1510061389e73ad68e6d21d2c52833cf8e7e8a0a0b3e67
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 9796 bytes
SHA-256: 345fca880f8c1158b837d236607d02f253874b48aa5906b6e206e6eadbfe5cc3